Effect of lanthanum cerium methionine on the properties of natural rubber

IF 1.1 4区材料科学 Q4 MATERIALS SCIENCE, COMPOSITES

Progress in Rubber Plastics and Recycling Technology Pub Date : 2022-01-20 DOI:10.1177/14777606211066320

Shuai Li, Zhaogang Liu, Wei Hao, Wentao Zhang, Yanhong Hu, Jinxiu Wu

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Abstract

Lanthanum cerium methionine was synthesized using the metathesis method and its molecular formula was confirmed as La0.35Ce0.65Cl3(C5H10NO2S)3·2H2O via Inductively Coupled Plasma Optical Emission Spectrometer, FTIR, and thermogravimetry-differential scanning calorimetry characterization methods. Lanthanum cerium methionine can significantly reduce the activation energy of the vulcanization reaction. The vulcanization kinetics model is used to fit the vulcanization curve of the rubber, and the obtained vulcanization activation energy of lanthanum cerium methionine for rubber is E1 = 76.89 KJ/mol, E2 = 102.36 KJ/mol and E3 = 126.00 KJ/mol. The above value is lower than pristine rubber. The Kissinger method and Flynn–Wall–Ozawa method were used to analyze the activation energy of thermal-oxidative degradation of vulcanized rubber. It was found that the rubber added with lanthanum cerium methionine exhibited higher thermal-oxidative degradation activation energy compared to that of pristine rubber; in addition, it was more difficult to age under the same environment. These results indicated that lanthanum cerium methionine can be not only used as a vulcanization accelerator, but also plays a role in resisting thermal and oxygen aging.

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镧铈蛋氨酸对天然橡胶性能的影响

通过电感耦合等离子体发射光谱仪、FTIR、热重-差示扫描量热等表征方法，确定了镧铈甲硫氨酸的分子式为La0.35Ce0.65Cl3(C5H10NO2S)3·2H2O。镧铈蛋氨酸能显著降低硫化反应的活化能。采用硫化动力学模型拟合橡胶的硫化曲线，得到镧铈甲硫氨酸对橡胶的硫化活化能为E1 = 76.89 KJ/mol, E2 = 102.36 KJ/mol, E3 = 126.00 KJ/mol。上述数值低于原始橡胶。采用Kissinger法和Flynn-Wall-Ozawa法对硫化橡胶热氧化降解活化能进行了分析。结果表明，添加镧铈蛋氨酸的橡胶比未添加的橡胶表现出更高的热氧化降解活化能;此外，在相同的环境下，更难以老化。这些结果表明，镧铈蛋氨酸不仅可以作为硫化促进剂，而且可以起到抗热、抗氧老化的作用。

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来源期刊

Progress in Rubber Plastics and Recycling Technology MATERIALS SCIENCE, COMPOSITES-POLYMER SCIENCE

CiteScore

4.40

自引率

7.70%

发文量

审稿时长

>12 weeks

期刊介绍： The journal aims to bridge the gap between research and development and the practical and commercial applications of polymers in a wide range of uses. Current developments and likely future trends are reviewed across key areas of the polymer industry, together with existing and potential opportunities for the innovative use of plastic and rubber products.